CI - update pgsql to 13

[mgravell]

CI is seeing:

Starting PostgreSQL 9.6
Start-Service : Cannot find any service with service name 'postgresql-x64-9.6'.
At line:1 char:1
+ Start-Service 'postgresql-x64-9.6'
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (postgresql-x64-9.6:String) [Start-Service], ServiceCommandException
    + FullyQualifiedErrorId : NoServiceFoundForGivenName,Microsoft.PowerShell.Commands.StartServiceCommand

I suspect this is due to these updates

Crossref: #2118

Looks good:

Starting PostgreSQL 13